To calculate Ward's average hourly rate, we first need to determine his total earnings for the week and then divide that by the total number of hours he works in a week.
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Total earnings from sales: \[ \text{Total earnings} = \text{Earnings per fax machine} \times \text{Number of fax machines sold} \] \[ \text{Total earnings} = 108 \times 11 = 1,188 \]
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Total hours worked in a week: \[ \text{Total hours} = \text{Days worked per week} \times \text{Hours worked per day} \] \[ \text{Total hours} = 6 \times 9 = 54 \]
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Average hourly rate: \[ \text{Average hourly rate} = \frac{\text{Total earnings}}{\text{Total hours worked}} \] \[ \text{Average hourly rate} = \frac{1,188}{54} = 22 \]
So, Ward's average hourly rate is $22 an hour.